15-GHz variability of 9C sources

Details 15-GHz variability of 9C sources 15-GHz variability of 9C sources

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.370.1556b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 370, Issue 3, pp. 1556-1564.

Astronomy and Astrophysics

Astronomy

10

Surveys: Galaxies: Active: Radio Continuum: General, Surveys, Galaxies: Active, Radio Continuum: General

Scientific paper

We present results from a 3-yr study of the 15-GHz variability of 51 9C sources. 48 of these sources make up a subsample of a larger one complete to 25mJy in 9C, and as the sources are selected pseudo-randomly the results should be representative of the complete sample. 29 per cent of this subsample are found to be variable above the flux calibration uncertainties of ~6 per cent. 50 per cent of the flat-spectrum objects are variable whilst none of the steep-spectrum objects or the objects with convex spectra peaking below 5GHz are variable. Nine of the objects studied have convex spectra and peak frequencies above 5GHz eight of these were found to vary at 15GHz, suggesting that the high-frequency peaking class in this sample is largely populated by objects with jets aligned close to the line of sight whose emission is dominated by beamed components.

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